Could you please describe your application: %?i~`0-:n% 1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... &!0%"4 2, is the fiber single mode or multimode? what is the NA, core dia,... c7f11N!v>b QvvH/u Generally, fiber coupling efficiency of 40%~90% is reasonable. .e1Yd8 HWOOw&^< Again let us know your specific bug. OTV$8{ bO6LBSZx] MANG2004 Qzq3{%^x_